Top weekend shows: Pitchfork, Chaka Khan, Z-Trip

Pitchfork Music Festival: The seventh annual gathering of the indie tribes will be headlined by Feist, Godspeed You! Black Emperor and Vampire Weekend, with much-anticipated sets by Wild Flag, Danny Brown, Willis Earl Beal, Big K.R.I.T and the Olivia Tremor Control, among dozens of others. Saturday is sold out, but tickets remain for Friday and Sunday, 3 p.m. Friday and 1 p.m. Saturday-Sundy at Union Park, 1501 W. Randolph, $45 each day; pitchfork.com.

Chaka Khan and Raphael Saadiq: Two singers steeped in old-school soul and funk, with Khan looking back on four decades of hits and former Tony! Toni! Toné! vocalist Saadiq coming off one of his best albums, “Stone Rollin’,” 5:30 p.m. Saturday at Petrillo Bandshell, Grant Park, free ($25 pavilion); explorechicago.org.

Z-Trip: Zach Sciacca helped break the art of the mash-up wide open a decade ago, and he’s still one of the best in the game with his encyclopedic knowledge of music and technical acumen, 9 p.m. Saturday at House of Blues, 329 N. Dearborn, $22.50 (advance) and $25; houseofblues.com.